Aquarius was granted the supernatural ability to take on the forms and abilities of his fellow Zodiak leaders by the demon Slifer.

As Aquarius, Bentley had no superhuman powers. He controlled the branch of the Zodiac crime cartel that operated out of San Francisco, California. He had above average fighting skills, but used no weapons.
As the One-Man Zodiac, he could transform into a representation of any of the twelve signs of the Zodiac, and would possess that sign's respective powers. For example, as Leo, he had razor sharp metal claws that could rend solid steel. As Scorpio, he possessed the Zodiac Key, which can fire powerful energy blasts. As Taurus he rode a motorcycle outfitted with various weapons. Many, but not all, of these forms were virtually identical to that of the original Zodiac cartel members.